Thermoelectric performance of n-type Bi2S3-alloyed Bi2Te2.7Se0.3

The effect of isovalent sulfur substitution on the thermoelectric properties of n-type Bi2Te2.7Se0.3 alloy has been studied systematically. At low sulfur concentrations, where the samples are single phase, changes in defect chemistry and density of states impacted significantly electrical resistivit...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 691; p. 416299
Main Authors Fortulan, Raphael, Brown, Adam, Serhiienko, Illia, Mori, Takao, Aminorroya Yamini, Sima
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.10.2024
Subjects
Bi2S3
Bi2Te2.7Se0.3
Bismuth telluride
n-type
Sulfur added
Thermoelectric
Bi2Te2.7Se0.3
Bi2S3
Thermoelectric
n-type
Sulfur added
Bismuth telluride
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Summary:The effect of isovalent sulfur substitution on the thermoelectric properties of n-type Bi2Te2.7Se0.3 alloy has been studied systematically. At low sulfur concentrations, where the samples are single phase, changes in defect chemistry and density of states impacted significantly electrical resistivity and thermopower. Isovalent sulfur substitution enhanced thermopower and reduced thermal conductivity for both single and multiphase samples. This reduction in thermal conductivity was particularly noticeable in samples containing Bi2S3-based secondary phase, reaching a low thermal conductivity of ∼0.3 W m−1 K−1 at 525 K. A maximum figure of merit, zT, of 0.55 was achieved for the sample with the highest sulfur content, demonstrating the potential of this approach to optimise the thermoelectric performance of Bi2Te3-based materials.
ISSN:0921-4526
DOI:10.1016/j.physb.2024.416299